Google shows operating hours as 06.30 to 10.15. Previous discussion on this thread shows similar hours. Insufficient for a LLC based aircraft to able to get back in after third rotation without risk of diversion. Apparently, not unusual for late returns to divert to Bournemouth and coach back..... not something a LCC would want as they would need to relocate the aircraft back to SOU the following morning or coach the passenger to BOH for the first rotation.